Merge remote-tracking branch 'origin/further_unused_arguments_cleanup' into integration_2026_w15 (!3977)

Further unused arguments cleanup

More fixes for unused function arguments (see #1057),
add_compile_options(-Wunused-parameter) added in folders:
- nfapi
- openair2
- openair3
- USRP
- rfsimulator

openair2/UTIL/OPT/probe.c

@@ -189,7 +189,9 @@ static int PCAP_WritePDU(const uint8_t *PDU,
   return length;
 }
 
-static void *opt_listener_thread(void *arg) {
+static void *opt_listener_thread(void *arg)
+{
+  UNUSED(arg);
   ssize_t ret;
   struct sockaddr_in from_address;
   socklen_t socklen = sizeof(from_address);